TBnor's profile - activity

NetworkingSetup (#1 to #3 through #2) The network I need to run my system has multiple constraints that would be easy to

NetworkingSetup (#1 to #3 through #2) The network I need to run my system has multiple constraints that would be easy to

NetworkingSetup (#1 to #3 through #2) The network I need to run my system has multiple constraints that would be easy to

NetworkingSetup (#1 to #3 through #2) The network I need to run my system has multiple constraints that would be easy to

I've worked quite a bit with these issues, and I would say that you'd be surprised how extremely efficient ROS is. I mus

I've worked quite a bit with these issues, and I would say that you'd be surprised how extremely efficient ROS is. I mus

Hokuyo, Velodyne, up to date experiences? Hello, I just messed up my rplidar. Kinda needed that, but the range is t

Yes! I will do just that, as soon as possible, feel free to close/delete this one. I've worked ~10 hours since then and talked to the distributor; clarified a whole lot.

Hello,

I am trying to avoid the simple questions, so trust me; I've really tried to figure out this for myself. But I find this to be am beyond my understanding.

Situation - I am acquiring BGR-preprocessed stereo view, but this has raised some issues for me. While the camera software is aimed towards Igloo (and Jade's?) "uvc-camera".

For concretizing purposes, let's assume the simplest version of "differential wheeled robot"; with a base footprint, base link etc - as frequently addressed in tutorials.

My goal is to achieve perception of the environment utilizing as much as possible from generic packages,.,

The camera is published under the /stereo/ namespace 1) How do you describe a stereo camera through xacro/urdf? - Is the camera "one"; with e.g. "optical frame" as origin? Or should the left and right camera be described in a separate manner? - Which frames/transforms am I advised to implement? - Should I utilize a dedicated driver?

2) I am finding a recurring error-messages relating to the packages expecting a colored image. At the same time I am facing all these other challenges, making it impossible for me to deduce whether this is a cause or a consequence.' - I have implemented stereo_image_proc ; but without these issues addressed I find it natural that I don't get any disparity or pointcloud data.

3) If colored images are required; could it be an idea to process the BGR-frames captured; use OpenCV to create a colored image intensifying parameters of interest, and then feeding these to the stereo-vision algorithms at a lower framefrate? (I have managed to utilize the BGR images for cv-processing by using a "cv_bridge"-node).

4) Related to the abovementioned; how do I successfully propagate odometry / pose in a simple conceptual system, where an ekf-node provdes filtered sensordata? I'm assuming I should remap the topic somewhere, but I'm struggling to catch the essential factor here.

5) In general as with the camera; I'm struggling with the countless possibilities relating to frames, tf's and dedicated drivers. Should I use a kobuki or a differential driver? What are the main pro's and con's? (It should be mentioned that I won't receive my wheel encoders before the end of next week, so for now I will have to estimate odometry. )

I hope I'm not completely off track here, thanks in advance. Please notify me if I should change and/or elaborate on any of these issues.

I think you will find it challenging to implement without any perception of depth. You would have to "fabricate" the environment based on 2D-computervision, providing pointcloud / laserscan to the stack.

The RPi probably lacks the computing power also; but that is an assumption based on experiences working with depth perception - which implies the amount of data published by these devices.

Don't take my word for anything, I'm just a couple of months into ROS myself.

Thanks, this was spot on :)

See you around, I guess.

TB

Hello,

I picked up ROS around Christmas, and I’m struggling with some core concepts here. I’ve read all tutorials, multiple times, so please don’t just reference me to one of those…

When I follow a tutorial I will most likely end up with ng a workspace, add a package or even “create one”*; before making the catkin workspace.

Now I can roscore, rosrun and listnodes at my heart’s desire. Everything work’s and I’m having a good time. Then, I see I can extend on the previous, and in a matter of minutes I am no longer having a good time.

Now I am making new workspaces, adding packages, deleting packages, by hand and by commandline, really messing everything up big time.

I’ve attempted to define the core of my problems (Please forgive my noobishness, I’ve barely used cmake before and I wrote my first code in 2015) :

When first initializing and making some package or set of packages: 1) What is the correct way of adding/removing packages from a workspace? 2) Should always dependencies be listed to create a package (catkin_create_pkg package_name_pkg rospy rviz etc); before adding the “src” content of the package? 3) Is there any real catch (for a newb) to overlay the workspace with echo ~/source --- bashrc ?

When the initial workspace is up and running: 1) Can I just add, i.e a launch file, without doing anything more/building something?
2) If I did something wrong, maybe write xviz instead of rviz, how can I fix this? Do I have to re-initialize the whole package?

When I want to extend the made workspace with an additional package (my main issue): 1) When downloading a package from the web, do you always have to make it with catkin before it can be used? 1.1)If not, how can I tell if I can just use the script after placing it in the folder, versus when I have to remake/update something? 2) Is there a difference between how packages work? Like; could I download the built package at one site, while another site provided me with the source-files that had to be built?

In general, is it recommended to add more new packages, or to edit the one(s) one already has in place? (Not talking large-scale teamwork, but for i.e one dedicated and experienced individual creating something).

Bonus Q: 1)) When multiple device are supposed to interact – they would all need the same catkin workspace? Would every device compile it’s own in full?

Sorry I have a hard time to really express what I am struggling with. I would deeply appreciate any kind of general (basic) discussion around all related topics, so please don’t try to be short 